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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
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<body>
    <script>
        var arr = ["张三","李四","王五","赵六","田七"];
        //删除下标为2的那个元素
        var index = 2;
        for(var i = index; i < arr.length - 1 ; i++){
            arr[i] = arr[i+1]        
        }   
        arr.length --
        /* 
            代码自动保存
        */   
        console.log(arr);
    </script>
</body>
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